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use a callback to pass the bandwidth to the pacer

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This commit is contained in:
Marten Seemann 2020-06-16 14:01:11 +07:00
parent 467e553f2b
commit 312b8d37f0
2 changed files with 15 additions and 17 deletions
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10
internal/congestion/pacer_test.go
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@ -13,9 +13,11 @@ var _ = Describe("Pacer", func() {
var p *pacer
const packetsPerSecond = 42
var bandwidth uint64 // in bytes/s
BeforeEach(func() {
p = newPacer(packetsPerSecond * uint64(maxDatagramSize)) // bandwidth: 42 full-size packets per second
bandwidth = uint64(packetsPerSecond * maxDatagramSize) // 42 full-size packets per second
p = newPacer(func() Bandwidth { return Bandwidth(bandwidth) * BytesPerSecond })
})
It("allows a burst at the beginning", func() {
@ -26,7 +28,7 @@ var _ = Describe("Pacer", func() {
It("allows a big burst for high pacing rates", func() {
t := time.Now()
p.SetBandwidth(10000 * packetsPerSecond * uint64(maxDatagramSize))
bandwidth = uint64(10000 * packetsPerSecond * maxDatagramSize)
Expect(p.TimeUntilSend()).To(BeZero())
Expect(p.Budget(t)).To(BeNumerically(">", maxBurstSize))
})
@ -94,14 +96,14 @@ var _ = Describe("Pacer", func() {
It("changes the bandwidth", func() {
t := time.Now()
sendBurst(t)
p.SetBandwidth(uint64(maxDatagramSize)) // reduce the bandwidth to 1 packet per second
bandwidth = uint64(maxDatagramSize) // reduce the bandwidth to 1 packet per second
Expect(p.TimeUntilSend()).To(Equal(t.Add(time.Second)))
})
It("doesn't pace faster than the minimum pacing duration", func() {
t := time.Now()
sendBurst(t)
p.SetBandwidth(1e6 * uint64(maxDatagramSize))
bandwidth = uint64(1e6 * maxDatagramSize)
Expect(p.TimeUntilSend()).To(Equal(t.Add(protocol.MinPacingDelay)))
Expect(p.Budget(t.Add(protocol.MinPacingDelay))).To(Equal(protocol.ByteCount(protocol.MinPacingDelay) * maxDatagramSize * 1e6 / 1e9))
})